The hardness of diamond should not be confused with its relative toughness,or resistance to shattering on impact. Diamond is the hardest natural substance,but it is far from the toughest,and in fact it is brittle.If you drop a diamond on a hard surface or hit with something hard,it can crack or shatter.
Because of its softness and its structural weakness caused by the asbestos “horsetail “includsions,the facet edges of demantoid are easily damaged or worn down with repeated use.Because of the lack of durability and the high value of demantoid stones,this is not a good choice for jewelry that gets hard daily use.
Mix of almandine and pyrope is called rhodolite
Vedic astrologist believe hessonite to be powerful talisman to increase longevity and happiness. Ancient Hindus believed hessonite to be fingernails of a great demon
Spectacular inclusions of Spessartine, similar “horsetail “of the demantoid
Zircon is also interesting because of its remarkabley great age.In fact,nothing on earth is older,as far as we know.The oldest known piece of the earth is a zircon crystal from Western Australia,which is dated at 4.4 billion years before present.This zircon is in the collection of the natural history museum in Perth,Weetern Australia.
Melanite is the darkest form of andradite, color due to trace of elements-titanium, sometimes reffrred to as titanium andradite, used in mourning jewelry during the Victorian era. melanite occurs in volcanic and metamorphic rock
Uvite-intense emerald-green variety containing trace of vanadium.Uvite is usually found in lightly metamorphic rocks that are rich in calcium,and it forms stubby,prismatic to tabular crystals with pyramidal termination.
Some of the Malawi material also has a slight brownish tinge;but this can be removed by heat-treating the stone with temperatures of about 700℃.This process turns the secondary color of the stone yellow to match the primary yellow color.The heat-treated stones are completely stable,and the pure yellow color appears to be irreversible.Coincidentally,imported rough Malawi stones occasionally have a noticeable lemon swell to go with their lemon-yellow color.This is Because the miners often boil the crystals in water and lemon juice to dissolve a blank coating that covers the stones when newly removed from the ground.The price does not alter the color of the stone.The acidic lemon juice simply helps dissolve the alkaline coating.The Tumbuku mine in Malawi was said to have employees whose sole job is to procure and squeeze lemons for the process.Stonecutters in the United States and elsewhere who have worked with Malawi canary material say it gives off a faint lemon odor when it is cut and polished.
Zircon is defined by the chemical composition ZrSiO4,and it has been used for nearly all colors of Zircon at one time or another.Here we follow a more restricted definition for this variety,including only reddish-brown,Brown,red,and orange Zircon as hyacinth,and excluding yellow,blue,green,and colorless hues.
The name imperial Topaz is thought to have originated in nineteenth-century Russia,in the Ural Mountain mines where it was first discovered.At that time,pink and red Topaz were said to have been reserved exclusively for the family of the Czar,which is why it is called “imperial”Topaz.
Topaz is the hardest of all silicate minerals. A recent trend in the jewelry trade is an iridescent-colored stone called “Mystic-Topaz”that display many colors.The unusual color effect is not natural and is the result of applying a thin coating of Titanium Oxide to the surface of the stone.Although topaz is hard gemstone,it is also somewhat BRITTLE or SHATTERED with a hard blow.
The most valuable color in the world is an intense CRIMSON color commonly called PIGEON BLOOD red.One of the world’s most valuable faceted fine rubies is the CARMEN LUCIA ruby. Today key words-crimson ,chrome,kermes oak,Carmen Lucia Ruby
The most valued blue sapphires are neither very dark nor pale,they are a soft,velvety, vivid blue shade called “cornflower blue”or “Kashmir blue”.
In the sixteen century,a common folklore was that colorless sapphire was a form of unripe ruby,and that if it was left to mature,it would one day become a red ruby